Messages in this thread |  | | | Date | Mon, 13 Sep 2004 19:27:02 -0500 | | From | hotdog day <> | | Subject | 2.6.9-rc2 and Hyperthreading. (SMT) |
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I have been testing the 2.6.9-rc1, and 2.6.9-rc2 kernel patches over the past couple days and have been having some issues with hyperthreading (SMT) turned on.
This problem first exhibited itself when I was testing 2.6.9-rc2-mm2-love2. I noticed the following quirks that ONLY show themselves with hyperthreading enabled on my 3.0C Pentium 4.
Random HARD LOCKS. No messages from the kernel. Just a good swift hard lock.
Hard locks when mounting two cdrom drives in quick succession.
Turning off hyperthreading solves these issues. Going back to 2.6.8.1 solves these issues.
I then tried 2.6.9-rc1 with no mm or love patches. I had the exact same issues.
Today I downloaded the prepatch to 2.6.9-rc2 and applied it to clean 2.6.8 source. The issues are still there.
I hope someone is paying attention to the way scheduler tweaks and changes are affecting SMT enabled kernels. I don't think anyone wants to disable features of their hardware in order to run an optimized scheduler. - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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